Biagini, Hugo E., Filosofía americana e identidad 'El conflictivo caso argentino', Buenos Aires, EUDEBA, 1989, 342 p.

Fil: Sánchez, Néstor Hugo

Segundo encuentro nacional de Fenomenología

Fil: Sánchez, Néstor Hugo

El estudio de las influencias filosóficas en el pensamiento argentino : Alejandro Korn

Fil: Sánchez, Néstor Hugo

Diversity and temporal variation of bees of the genus Centris (Hymenoptera: Apidae: Centridini) in the dry forest ecosystem Tatacoa Desert (Neiva-Huila)

El género Centris es un grupo de origen neotropical, considerado un polinizador importante de varios ecosistemas. A pesar de su importancia, en Colombia es poca la información relacionada sobre su diversidad, particularmente en la zona sur del país. Considerando lo anterior, este trabajo tuvo como objeto conocer la diversidad y variación temporal de abejas del género Centris (Fabricius 1804) en el Desierto de la Tatacoa ubicado en el departamento del Huila. Se realizaron muestreos mensuales, entre diciembre de 2014 y enero 2016, en un área de aproximadamente 8 km2. Las abejas se colectaron directamente con red entomológica y adicionalmente se ubicaron nidos trampa fabricados con diferentes materiales. Se identificaron taxonómicamente los ejemplares y se realizó la descripción del esterno 8 y de la genitalia de los machos. Se calculó la diversidad de abejas del género Centris durante el estudio y se evaluó el efecto de las variables climáticas en la riqueza y abundancia temporal. Se identificaron cinco especies distribuidas en 136 especímenes teniendo a Centris varia y Centris trigonoides como las especie más dominantes. Las especies restantes son nuevos reportes para el departamento. Según el estimativo de diversidad Shannon, El Desierto de la Tatacoa tiene una diversidad baja (1,64). El carácter esterno 8 y la genitalia de los machos mostraron diferencias en dos de las cinco especies, se concluye de esto que el carácter genitalia pueden llegar a ser importante para la identificación de individuos. Se encontró una relación inversamente proporcional entre la temperatura y cantidad de individuos en donde a mayor temperatura menor cantidad de especies. Los nidos trampa pueden ser un método de captura eficiente, a pesar de solo obtener el 4 % de eclosión se observó una alta colonización de estos.The genus Centris is a group of neotropical origin and considered an important pollinator of several ecosystems. Despite its importance, Colombia has little information on its diversity, particularly in the south of the country. Considering the above, this work had as objective to know the diversity of bees of the genus Centris (Fabricius 1804) in the Desert of the Tatacoa located in the department of Huila. Monthly sampling was carried out between December 2014 and January 2016 in an area of approximately 8 km2. The bees were collected directly with an entomological net and trap nests made of different materials were placed. Once collected, the specimens were identified to the taxonomic level possible and the sternum 8 and genitalia of the males were described. The diversity of bees of the genus Centris was calculated during the study and the effect of climatic variables on temporal richness and abundance was evaluated. Five species distributed in 136 specimens were identified with Centris varia and Centris trigonoides as the most dominant species. The remaining species are new reports for the department. According to the Shannon diversity estimate, the Tatacoa Desert has a low diversity (1.64). The sternum character 8 and the genitalia of males showed differences in two of the five genitalia species may become important for the identification of individuals. An inversely proportional relationship was found between the temperature and quantity of individuals where at a higher temperature a smaller number of species. Trap nests may be an efficient capture method, despite only obtaining 4% hatching, a high colonization of these was observed.Pregrad

A phylogenetic study of Ferocactus Britton and Rose (Cactaceae: Cactoideae)

Ferocactus is the third largest genus in the tribe Cacteae of the Cactoideae, and the number of species is still matter of taxonomic discussion. The different interpretation of morphological characters has led to discrepancies in species boundaries. This dissertation includes four papers describing the taxonomic history of Ferocactus to elucidate its evolutionary history and phylogenetic relationships with related taxa of the tribe Cacteae. The first paper is a general review of Ferocactus and summarizes the knowledge of the genus and discusses the relevance of understanding its phylogenetic relationships at the specific, generic and tribal levels. The second paper is a survey to study chromosome numbers in 14 taxa of Ferocactus, all of which have the base number of x=11. Analyses of meiotic figures failed to provide evidence of hybridity, at least for the populations investigated. The third and fourth papers are general accounts of molecular studies in Ferocactus to investigate its putatively monophyletic origin. These two papers approach the problems using molecular data generated from restriction site analysis (third paper) of the chloroplast DNA (cpDNA) and sequence data from two non-coding regions (rpl16 and intergenic spacer between the trnL and trnF genes) (fourth paper) of the cpDNA. Parsimony analyses of the restriction site variants and the two DNA sequence data sets have provided insight into the phylogenetic relationships between Ferocactus and Echinocactus grusonii. The three molecular phylogenies are consistent in identifying a clade in which E. grusonii is sister to F. histrix and F. glaucescens. This clade suggests that Ferocactus, as currently circumscribed, might be paraphyletic; the taxonomic implications of this relationship are discussed. In addition, E. grusonii is basal to F. histrix and F. glaucescens in the phylogeny of the restriction site variants further indicating that Ferocactus might have shared a common ancestor with Echinocactus. The phylogenetic relationships at the interspecific level remain unresolved, perhaps due to a rapid radiation of Ferocactus and other members of the tribe Cacteae which involved morphological differentiation accompanied by little genetic divergence. Some species groups form small clades which in turn correlate with the geographic distribution (northern and southern) of Ferocactus throughout its extant geographic range

Post-training discriminative pruning for RBMs

One of the major challenges in the area of artificial neural networks is the identification of a suitable architecture for a specific problem. Choosing an unsuitable topology can exponentially increase the training cost, and even hinder network convergence. On the other hand, recent research indicates that larger or deeper nets can map the problem features into a more appropriate space, and thereby improve the classification process, thus leading to an apparent dichotomy. In this regard, it is interesting to inquire whether independent measures, such as mutual information, could provide a clue to finding the most discriminative neurons in a network. In the present work we explore this question in the context of Restricted Boltzmann Machines, by employing different measures to realize post-training pruning. The neurons which are determined by each measure to be the most discriminative, are combined and a classifier is applied to the ensuing network to determine its usefulness. We find that two measures in particular seem to be good indicators of the most discriminative neurons, producing savings of generally more than 50% of the neurons, while maintaining an acceptable error rate. Further, it is borne out that starting with a larger network architecture and then pruning is more advantageous than using a smaller network to begin with. Finally, a quantitative index is introduced which can provide information on choosing a suitable pruned network.Fil: Sánchez Gutiérrez, Máximo. Universidad Autónoma Metropolitana; MéxicoFil: Albornoz, Enrique Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigación en Señales, Sistemas e Inteligencia Computacional. Universidad Nacional del Litoral. Facultad de Ingeniería y Ciencias Hídricas. Instituto de Investigación en Señales, Sistemas e Inteligencia Computacional; ArgentinaFil: Rufiner, Hugo Leonardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigación en Señales, Sistemas e Inteligencia Computacional. Universidad Nacional del Litoral. Facultad de Ingeniería y Ciencias Hídricas. Instituto de Investigación en Señales, Sistemas e Inteligencia Computacional; Argentina. Universidad Nacional de Entre Ríos; ArgentinaFil: Close, John Goddard. Universidad Autónoma Metropolitana; Méxic

Process urban east of San Juan expansion : diagnosis and proposals for action for balanced territory

Las estructuras urbanas en América Latina se han transformado sustancialmente a partir de la década de 1970, definiéndose un nuevo modelo de ciudad dispersa cuyo principio estructurador es la fragmentación, el que se puede ser identificado en la ciudad de San Juan, núcleo de máxima jerarquía. El este de la ciudad, que se corresponde con el departamento de Santa Lucía, es la zona que menos crecimiento ha registrado desde principios del siglo XX, y hoy se convierte en aquella que registra fuertes transformaciones en su estructura territorial. Como objetivo general, se pretende explicar el modelo de desarrollo urbano disperso que se está manifestando al este del Gran San Juan, identificando las causas que lo generan y los desequilibrios que se manifiestan e impactan en la estructura espacial. El esquema metodológico sigue los lineamientos propuestos por Gómez Orea (2002) que comprende un diagnóstico sistémico para explicar el actual modelo de organización territorial, con el fin de poder interpretar la situación actual del sistema analizado. Las definiciones que resulten del modelo actual, permitirá la definición de acciones estratégicas orientadas a corregir los desequilibrios detectados y conlleven a un desarrollo urbano armonioso.Urban structures in Latin America have changed substantially since the 1970s, defining a new model of dispersed city whose organizing principle is fragmentation, which can be identified in the city of San Juan, coretop hierarchy. The east of the city, which corresponds to the department of Santa Lucia, the area is less growth recorded since the early twentieth century, and now becomes a strong territorial transformations in its structure. Overall objective is to explain the pattern o dispersed urban development that is manifesting east of Greater San Juan, identifying what the causes and imbalances that occur and impact the spatial structure. The methodological approach followed the guidelines proposed by Gómez Orea (2002) comprising a systemic diagnosis to explain the current model of territorial organization in order to understand the current situation of the analyzed system. The definitions resulting from the current model, allow the definition of strategic actions that aim to correct identified imbalances andrequire a harmonious urban development.Fil: Sánchez, Sandra Esther. Universidad Nacional de San JuanFil: Tejada, Hugo. Universidad Nacional de San Jua

Chiesa romana e modernità giuridica. Vol. I: L’edificazione del sistema canonistico (1563-1903); Vol. II: Il Codex Iuris Canonici (1917). [Reseña]

Reseña de: Carlo Fantappiè, Chiesa romana e modernità giuridica. Vol. I: L’edificazione del sistema canonistico (1563-1903); Vol. II: Il Codex Iuris Canonici (1917), (= Biblioteca per la storia del pensiero giuridico moderno, 76), Giuffré, Milano 2008, XLVI - 1275 pp

PVT-Robust CMOS Programmable Chaotic Oscillator: Synchronization of Two 7-Scroll Attractors

Designing chaotic oscillators using complementary metal-oxide-semiconductor (CMOS) integrated circuit technology for generating multi-scroll attractors has been a challenge. That way, we introduce a current-mode piecewise-linear (PWL) function based on CMOS cells that allow programmable generation of 2–7-scroll chaotic attractors. The mathematical model of the chaotic oscillator designed herein has four coefficients and a PWL function, which can be varied to provide a high value of the maximum Lyapunov exponent. The coefficients are implemented electronically by designing operational transconductance amplifiers that allow programmability of their transconductances. Design simulations of the chaotic oscillator are provided for the 0.35μ m CMOS technology. Post-layout and process–voltage–temperature (PVT) variation simulations demonstrate robustness of the multi-scroll chaotic attractors. Finally, we highlight the synchronization of two seven-scroll attractors in a master–slave topology by generalized Hamiltonian forms and observer approach. Simulation results show that the synchronized CMOS chaotic oscillators are robust to PVT variations and are suitable for chaotic secure communication applications.Universidad Autónoma de Tlaxcala CACyPI-UATx-2017Program to Strengthen Quality in Educational Institutions C/PFCE-2016-29MSU0013Y-07-23National Council for Science and Technology 237991 22284